PCPartPicker part list:
http://pcpartpicker.com/p/2ZTPK
Price breakdown by merchant: http://pcpartpicker.com/p/2ZTPK/by_merchant/
Benchmarks: http://pcpartpicker.com/p/2ZTPK/benchmarks/
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($117.12 @ OutletPC)
Motherboard: ASRock 960GM/U3S3 FX Micro ATX AM3+ Motherboard ($53.99 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($69.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($79.28 @ SuperBiiz)
Video Card: Gigabyte GeForce GTX 660 2GB Video Card ($189.99 @ Amazon)
Case: Xion XON-560 MicroATX Mini Tower Case ($34.98 @ Newegg)
Power Supply: SeaSonic 400W 80+ Bronze Certified ATX Power Supply ($49.99 @ Mwave)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($89.99 @ NCIX US)
Total: $685.33
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-02-25 13:37 EST-0500)
here is what I came up with. Unfortunately I cant get it in the euros. So you will have to check that prices where you are at but a rough exchange puts the whole build at 410.50 pounds with the conversion. Not exact but a rough estimate.
I went with the gtx 660 better bang for the buck right now and a different mob that has 2 6g/b sata ports also the case I chose has usb 3.0 on the front so you can use that as well with this mob. Asrock is a really good brand for cheap builds. Also went windows 8.1.